At the Unicom Social Tools conference last week my old Lotus colleague Adrian Moss audio recorded most of the speakers and created a page to hold the material.
Take a look - you can play the talks online or download them all as a podcast. Its a great way of capturing an event though I think the podcast is of most value to people who attended the conference and wish to more closely listen again to a specific speaker.
For example, I recently recorded a talk of Dave Snowden's on my iPod and played it back on the train on the way home. The great thing about it was that when ever he said anything thought provoking or controversial I could pause the playback and think long and hard about the point he was making. I don't think I ever did get to the end of the playback!